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So, when did this problem begin?
Well, I had an erection last...

DEREK: "So, when did this problem begin?"STEVE: "Well, I had an erection last night and woke up with one this morning."MIRANDA: "Umm, Dr. Shepherd, if you don't need me, the other Dr. Shepherd needs a consult on one of the quints."DEREK: "Yeah, no we're fine. So when did you last ejaculate?"STEVE: "I'm not sure. Meredith?"CRISTINA: [leaves, tries not to laugh] "Oh, I'm... I'm gonna go with Dr. Bailey."STEVE: "Meredith, what time did we, uh...you know."DEREK: [smiles] "Yes, Meredith. What time did you two?"